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How to Implement Interact Different Networks in ns3

To implement interaction between different types of networks in ns3, we need to create a hybrid network topology where different network technologies like Wi-Fi, ethernet, and LTE can coexist and communicate with each other. This can be implemented by setting up a gateway node that acts as a bridge between various network segments. Here is detailed guide on achieving this.

Steps for implementation

Step 1: Set up the simulation

  • Download and install ns3 : Make sure that ns3 is installed in the computer. If not, install it from the official ns3 website.
  • Familiarize yourself with ns3 basics : Understand the basics of ns3 such as creating nodes, setting up channels, and running basic simulations etc.

Step 2: Create the network topology

Define a network topology that involves different network technologies such as Wi-Fi, Ethernet, and LTE.

Create hybrid network topology

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/wifi-module.h”

#include “ns3/lte-module.h”

#include “ns3/applications-module.h”

#include “ns3/mobility-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE(“HybridNetworkSimulation”);

int main(int argc, char *argv[])

{

CommandLine cmd;

cmd.Parse(argc, argv);

// Create nodes

NodeContainer wifiNodes;

wifiNodes.Create(2);

NodeContainer p2pNodes;

p2pNodes.Create(2);

NodeContainer lteNodes;

lteNodes.Create(2);

NodeContainer gatewayNode;

gatewayNode.Create(1);

// Set up Wi-Fi network

YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default();

YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default();

wifiPhy.SetChannel(wifiChannel.Create());

WifiHelper wifi;

wifi.SetRemoteStationManager(“ns3::AarfWifiManager”);

WifiMacHelper wifiMac;

Ssid ssid = Ssid(“ns-3-ssid”);

wifiMac.SetType(“ns3::StaWifiMac”, “Ssid”, SsidValue(ssid), “ActiveProbing”, BooleanValue(false));

NetDeviceContainer wifiDevices;

wifiDevices = wifi.Install(wifiPhy, wifiMac, wifiNodes);

wifiMac.SetType(“ns3::ApWifiMac”, “Ssid”, SsidValue(ssid));

wifiDevices.Add(wifi.Install(wifiPhy, wifiMac, gatewayNode.Get(0)));

// Set up point-to-point network

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute(“DataRate”, StringValue(“10Mbps”));

pointToPoint.SetChannelAttribute(“Delay”, StringValue(“2ms”));

NetDeviceContainer p2pDevices;

p2pDevices = pointToPoint.Install(p2pNodes);

p2pDevices.Add(pointToPoint.Install(p2pNodes.Get(0), gatewayNode.Get(0)));

// Set up LTE network

Ptr<LteHelper> lteHelper = CreateObject<LteHelper>();

Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper>();

lteHelper->SetEpcHelper(epcHelper);

Ptr<Node> pgw = epcHelper->GetPgwNode();

InternetStackHelper internet;

internet.Install(lteNodes);

internet.Install(gatewayNode);

NodeContainer ueNodes;

ueNodes.Add(lteNodes.Get(0));

NodeContainer enbNodes;

enbNodes.Add(lteNodes.Get(1));

NetDeviceContainer enbLteDevs = lteHelper->InstallEnbDevice(enbNodes);

NetDeviceContainer ueLteDevs = lteHelper->InstallUeDevice(ueNodes);

lteHelper->Attach(ueLteDevs, enbLteDevs.Get(0));

// Assign IP addresses

Ipv4AddressHelper address;

address.SetBase(“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer wifiInterfaces = address.Assign(wifiDevices);

address.SetBase(“10.2.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer p2pInterfaces = address.Assign(p2pDevices);

Ipv4InterfaceContainer ueIpIface;

ueIpIface = epcHelper->AssignUeIpv4Address(NetDeviceContainer(ueLteDevs));

Ptr<Node> ueNode = ueNodes.Get(0);

Ptr<Ipv4StaticRouting> ueStaticRouting = Ipv4RoutingHelper::GetRouting<Ipv4StaticRouting>(ueNode->GetObject<Ipv4>()->GetRoutingProtocol());

ueStaticRouting->SetDefaultRoute(epcHelper->GetUeDefaultGatewayAddress(), 1);

// Install applications

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(gatewayNode.Get(0));

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(p2pInterfaces.GetAddress(1), 9);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(10));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));

ApplicationContainer clientApps = echoClient.Install(wifiNodes.Get(1));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

// Enable tracing

pointToPoint.EnablePcapAll(“hybrid-network”);

wifiPhy.EnablePcap(“wifi”, wifiDevices.Get(0));

lteHelper->EnableTraces();

Simulator::Run();

Simulator::Destroy();

return 0;

}

Step 3: Configure Mobility

To simulate realistic scenarios where nodes can move, set up mobility models.

// Set up mobility

MobilityHelper mobility;

mobility.SetPositionAllocator(“ns3::GridPositionAllocator”,

“MinX”, DoubleValue(0.0),

“MinY”, DoubleValue(0.0),

“DeltaX”, DoubleValue(5.0),

“DeltaY”, DoubleValue(10.0),

“GridWidth”, UintegerValue(3),

“LayoutType”, StringValue(“RowFirst”));

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(gatewayNode);

mobility.SetMobilityModel(“ns3::RandomWalk2dMobilityModel”,

“Bounds”, RectangleValue(Rectangle(-50, 50, -50, 50)));

mobility.Install(wifiNodes);

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(p2pNodes);

Step 4: Install and Configure Applications

On the nodes, install applications to generate and process network traffic.

// Install applications

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(gatewayNode.Get(0));

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(wifiInterfaces.GetAddress(2), 9);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(10));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));

ApplicationContainer clientApps = echoClient.Install(lteNodes.Get(0));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

Step 5: Enable Tracing

To analyze the network performance enable tracing.

// Enable tracing

pointToPoint.EnablePcapAll(“hybrid-network”);

wifiPhy.EnablePcap(“wifi”, wifiDevices.Get(0));

lteHelper->EnableTraces();

Full Example Code

Here is an complete example by combining all the steps.

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/wifi-module.h”

#include “ns3/lte-module.h”

#include “ns3/applications-module.h”

#include “ns3/mobility-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE(“HybridNetworkSimulation”);

int main(int argc, char *argv[])

{

CommandLine cmd;

cmd.Parse(argc, argv);

// Create nodes

NodeContainer wifiNodes;

wifiNodes.Create(2);

NodeContainer p2pNodes;

p2pNodes.Create(2);

NodeContainer lteNodes;

lteNodes.Create(2);

NodeContainer gatewayNode;

gatewayNode.Create(1);

// Set up Wi-Fi network

YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default();

YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default();

wifiPhy.SetChannel(wifiChannel.Create());

WifiHelper wifi;

wifi.SetRemoteStationManager(“ns3::AarfWifiManager”);

WifiMacHelper wifiMac;

Ssid ssid = Ssid(“ns-3-ssid”);

wifiMac.SetType(“ns3::StaWifiMac”, “Ssid”, SsidValue(ssid), “ActiveProbing”, BooleanValue(false));

NetDeviceContainer wifiDevices;

wifiDevices = wifi.Install(wifiPhy, wifiMac, wifiNodes);

wifiMac.SetType(“ns3::ApWifiMac”, “Ssid”, SsidValue(ssid));

wifiDevices.Add(wifi.Install(wifiPhy, wifiMac, gatewayNode.Get(0)));

// Set up point-to-point network

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute(“DataRate”, StringValue(“10Mbps”));

pointToPoint.SetChannelAttribute(“Delay”, StringValue(“2ms”));

NetDeviceContainer p2pDevices;

p2pDevices = pointToPoint.Install(p2pNodes);

p2pDevices.Add(pointToPoint.Install(p2pNodes.Get(0), gatewayNode.Get(0)));

// Set up LTE network

Ptr<LteHelper> lteHelper = CreateObject<LteHelper>();

Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper>();

lteHelper->SetEpcHelper(epcHelper);

Ptr<Node> pgw = epcHelper->GetPgwNode();

InternetStackHelper internet;

internet.Install(lteNodes);

internet.Install(gatewayNode);

NodeContainer ueNodes;

ueNodes.Add(lteNodes.Get(0));

NodeContainer enbNodes;

enbNodes.Add(lteNodes.Get(1));

NetDeviceContainer enbLteDevs = lteHelper->InstallEnbDevice(enbNodes);

NetDeviceContainer ueLteDevs = lteHelper->InstallUeDevice(ueNodes);

lteHelper->Attach(ueLteDevs, enbLteDevs.Get(0));

// Assign IP addresses

Ipv4AddressHelper address;

address.SetBase(“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer wifiInterfaces = address.Assign(wifiDevices);

address.SetBase(“10.2.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer p2pInterfaces = address.Assign(p2pDevices);

Ipv4InterfaceContainer ueIpIface;

ueIpIface = epcHelper->AssignUeIpv4Address(NetDeviceContainer(ueLteDevs));

Ptr<Node> ueNode = ueNodes.Get(0);

Ptr<Ipv4StaticRouting> ueStaticRouting = Ipv4RoutingHelper::GetRouting<Ipv4StaticRouting>(ueNode->GetObject<Ipv4>()->GetRoutingProtocol());

ueStaticRouting->SetDefaultRoute(epcHelper->GetUeDefaultGatewayAddress(), 1);

// Set up mobility

MobilityHelper mobility;

mobility.SetPositionAllocator(“ns3::GridPositionAllocator”,

“MinX”, DoubleValue(0.0),

“MinY”, DoubleValue(0.0),

“DeltaX”, DoubleValue(5.0),

“DeltaY”, DoubleValue(10.0),

“GridWidth”, UintegerValue(3),

“LayoutType”, StringValue(“RowFirst”));

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(gatewayNode);

mobility.SetMobilityModel(“ns3::RandomWalk2dMobilityModel”,

“Bounds”, RectangleValue(Rectangle(-50, 50, -50, 50)));

mobility.Install(wifiNodes);

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(p2pNodes);

// Install applications

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(gatewayNode.Get(0));

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(p2pInterfaces.GetAddress(1), 9);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(10));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));

ApplicationContainer clientApps = echoClient.Install(wifiNodes.Get(1));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

// Enable tracing

pointToPoint.EnablePcapAll(“hybrid-network”);

wifiPhy.EnablePcap(“wifi”, wifiDevices.Get(0));

lteHelper->EnableTraces();

Simulator::Run();

Simulator::Destroy();

return 0;

}

On the whole, we had a performance analysis on the implementation of interact different networks using ns3 by creating a hybrid network topology where different network technologies like Wi-Fi, ethernet, and LTE can coexist and communicate with each other.

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